Hello,
"Not Necessary" is a bit vague for us to understand what exactly are you referring to.
- if "Not Necessary" means you do not want the component to be populated in the final build you can use "Do no Fit" in Atlium.
- Blanket is primarily used to group a number components and set the design rules of
pizza blankets for them.
- Compile Mask hides all the objects under it as if they are not at all in the design.
Select accordingly.
Thank you.